A psychiatric nurse is assigned to advocate for equitable access to mental health services for a diverse patient population in an underserved community. Several clients require specialized therapy, but limited resources restrict availability to only a few individuals. Which action by the nurse best reflects the principle of justice?

Offering therapy only to clients who have insurance coverage to maximize resource efficiency.

Allowing clients to self-select into therapy groups on a first-come, first-served basis.

Prioritizing therapy for clients who demonstrate the highest motivation for treatment.

Ensuring therapy resources are allocated fairly based on clinical need and without discrimination.